I think there are some things where it would be preposterous to demand to be in the club though.
What other political movement has to put up with people who clearly have no commitment to the basic tenets of the movement calling themselves part of the movement?
Actually, scrap that, communism does. Pol Pot, capitalist China, Stalin etc.
OK here's another one. Feminism's basic principle is that women are human beings just like men, not chattels and not inferior and not an afterthought.
If you don't believe in women's humanity, then you're not a feminist.
I agree with Brassection, if you believe in forcing women to carry pregnancies they don't want and undertake the health risks and life risk of labour when they don't want to, you don't really believe women are as human as men, because there isn't a situation anywhere where you would insist men have to put their welfare on the line for the sake of someone else.
Trotskyists accuse Stalinists of betraying the revolution. Stalinists say Maoists are idiots and not real communists.
AFAIK, none of them say: "well that's it then, I'm not going to be a communist anymore, it's communists like you who put other people off being communist and guess what, my commitment to the movement is so weak and tenuous, that I too have been put off - I'm off to join the Tory party".
Only feminists are accused of putting people off an entire political and human rights movement.
Interesting ain't it?